According to the Global Software Top 100 (2011 edition), 6 CAD/CAE/PLM software companies are among the the top 100.
They are: Dassault Systèmes, Autodesk, PTC, Siemens (UGS), Mentor Graphics and ANSYS.
Dassault and Siemens have the most complete ecosystem: CAD-CAM-CAE-PLM. Autodesk and PTC reply more on CAD. While Mentor Graphics has limited presence beyond in electronics industry. ...